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DOE-STD-1030-96
know, through training and qualification, the type and magnitude of hazards
involved in work on the equipment or system. They should understand what
methods will be used to control those hazards, and they should know how to
verify that the protection is adequate.
The machine or equipment should be shut down using normal operating
procedures. This produces an orderly shutdown and avoids the possibility of
added hazards or equipment damage that might result from simply
disconnecting the power or using some other unusual shutdown method.
Equipment isolation devices must be physically located and operated in such
a way as to isolate the equipment from the energy source.
-
Protection should not be based upon the presumed remote actuation of a
circuit breaker or valve. As an additional protection, it may be possible
to rack out a circuit breaker or remove a component (such as a fuse or a
piping spool piece) to isolate the equipment from an energy source.
-
If a component is already tagged (from another lockout/tagout) it must
NOT be operated or removed. Its position should be verified by all
other appropriate means, e.g., observation of system parameters, valve
position indicators, etc.
-
Personnel should verify the expected physical results of positioning each
component. If undesirable conditions are encountered, e.g., inability to
depressurize a piping system because of leakage through an isolation
valve, the responsible supervisor or manager should be contacted for
resolution.
Tags and locks should be attached to all isolation devices to clearly indicate
that operation is prohibited. In some large centrally controlled facilities,
including most commercial power plants, tags alone have been found to be
sufficient for protection. This is because of the training that all persons
receive and the strict procedures that govern operation of equipment in these
facilities.
-
If tags are used as the sole protection, the facility must demonstrate that
the tagout procedures afford the same protection as lockout.
20


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